Nearly half of India’s heroin seizures… are made here in Punjab, a northern state that has become a conduit for drugs from the terror-funding opium fields of Afghanistan to markets across Asia, Europe and elsewhere, [Indian] authorities say…

Overlapping groups of drug traffickers, criminals and Islamist fighters in Pakistan, they say, are ferrying anti-India Muslim extremists, counterfeit currency and weapons across the border. Authorities suspect the sale of heroin also helps finance jihadist attacks.

“Once you’ve figured a way in through the border, it becomes a conveyor belt,” an unnamed senior Punjab police official told the Journal. “You can push drugs or terrorists or anything else.”

Barbed-wire fencing reportedly lies along much of the 1,800-mile long international boundary between historical rivals India and Pakistan.

The border “is patrolled round the clock by heavily armed Indian guards,” reports WSJ, addingthat problems along the India-Pakistan border, namely human and heroin trafficking, are not unprecedented.

However WSJ notes:

[A]uthorities say recent cases point to increasingly regular contact between smugglers and militants. Investigations into a 2014 case have outlined an extensive network that appears to range across Afghanistan, Pakistan and Kuwait. Police that year arrested a 26-year-old constable named Khurshid Alam while he was allegedly delivering 22 pounds of heroin, wrapped in cloth bags labeled ‘Dawat Basmati Rice,’ to two men.

According to police documents and interviews with two officers involved in the case, Mr. Alam said his supplier was a [Pakistan-based] senior commander of Hizbul Mujahideen, an Islamist extremist group fighting for the separation of Kashmir, a disputed region both India and Pakistan claim.

Indian authorities reportedly allege that Hizbul Mujahideen is one the terrorist organizations backed by the Pakistani military, a claim that Pakistan denies.

Corruption in addition to “online mapping and instant-messaging services like WhatsApp” are helping smugglers, who are increasingly focusing on trafficking heroin because it is “much more lucrative” than other forms of contraband, points out WSJ, citing the anonymous senior Punjab police official.